J/ApJ/942/85ivo://CDS.VizieR/J/ApJ/942/85doi:10.26093/cds/vizier.19420085CDSMargon B.Morrell N.Massey P.Neugent K.F.Williams R.2025-07-18T20:13:23Z2024-12-30T12:54:13ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frwolf-rayet-starsvisible-astronomyspectroscopystellar-spectral-typesabsolute-magnitudetwo-color-diagramsinfrared-sourcesmagellanic-cloudsplanetary-nebulaeWe present the final results of an imaging and spectroscopic search for stars in the Large Magellanic Cloud (LMC) with CII{lambda}{lambda}7231,7236 emission lines. The goal is to identify and study [WC11] stars, the coolest of the low-mass Wolf-Rayet sequence, and a subset of central stars of planetary nebulae where the CII lines are known to be especially prominent. A recent serendipitous discovery of an LMC [WC11] raised the possibility that these objects, although difficult to identify, might in fact be more common than previously believed. Several new members of this rare class have been found in this survey. It now seems clear, however, that a significant number of these stars are not hiding among the general [WC] population. We point out that the CII doublet intensity ratio observed in our spectra proves to neatly divide the objects into two distinct groups, with the CII emission likely originating from either the stellar wind or a surrounding nebula. The physics of the CII emission mechanism correctly explains this bifurcation. Spectral subtypes are suggested for most of the objects. The numerous spectroscopic clues now available for these objects should facilitate future detailed modeling.2023ApJ...942...85Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/942/85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/85 : Sixth Catalogue of Galactic Wolf-Rayet Stars (van der Hucht+ 1981)III/215 : 7th Catalog of Galactic Wolf-Rayet stars (van der Hucht, 2001)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/337 : Gaia DR1 (Gaia Collaboration, 2016)VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)J/MNRAS/234/583 : Abundances in Magellanic Cloud PNe (Monk+ 1988)J/AJ/99/784 : IR photometry of LMC long-period variables (Hughes+ 1990)J/ApJS/75/407 : LMC & SMC PNe optical spectroscopy. I (Meatheringham+ 1991)J/A+A/403/659 : Classification of WR planetary nebulae (Acker+, 2003)J/AJ/128/1606 : Magellanic Clouds Photometric Survey: LMC (Zaritsky+, 2004)J/A+A/442/249 : Integrated spectrum of NGC 7027 (Zhang+, 2005)J/AJ/133/2393 : UBVRI phot. in seven Local Group dwarfs gal. (Massey+, 2007)J/A+A/530/A90 : Optically bright post-AGB pop. of LMC (van Aarle+, 2011)J/ApJ/831/L3 : NIR spectra of 10 PNe in LMC and SMC (Mashburn+, 2016)J/A+A/588/A25 : AGB & CSPNe evolutionary models (Miller Bertolami, 2016)J/ApJ/888/54 : Spectrum of a rare low-mass WR star in LMC (Margon+, 2020)J/ApJ/898/85 : CII emission-line stars in LMC with MagE sp. (Margon+, 2020)J/MNRAS/493/1512 : Galactic Wolf-Rayet stars with Gaia DR2 I (Rate+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/942/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/942/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/942/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/942/85https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/942/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/942/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/942/85/table1 (Spectroscopically verified LMC CII emission stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/942/85/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/942/85/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/942/85/table1?GETtext/xml+votable180.050000true69.6449167-70.61205560.005555555555555556Cone search capability for table J/ApJ/942/85/table2 (Spectra of candidates lacking CII emission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/942/85/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/942/85/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/942/85/table2?GETtext/xml+votable180.050000true70.6622917-72.22119440.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/ApJ/942/856/33047 33053 33055 33063 33074 33076 33091 33093 33096 33098-33100 33102-33103 33110 33121-33122 33126-33127 33136 375043.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/942/85?format=asciiOpticalInfrareddefaultJ/ApJ/942/85/table1Spectroscopically verified LMC CII emission starsspInteractive spectrum plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharfitsDownload the FITS filemeta.ref.urlchar_RAPositions from 2MASS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS names (declination part)degpos.eq.dec;meta.main2MASS2MASS identifier (HHMMSSSss+DDMMSSs; J2000)meta.id;meta.maincharClassClasssrc.spTypecharRefReference(s) (1)meta.ref;pos.framecharFileName of the FITS file in subdirectory "sp"; column added by CDSmeta.id;meta.fitscharZ04Display data from Zaritsky+ 2004, J/AJ/128/1606meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVmag[15/16.33] Johnson V magnitude (G1)magphot.mag;em.opt.VfloatVMag[-3.9/-2.5] Absolute V magnitude (G1)magphys.magAbs;em.opt.VfloatB-V[-0.16/1.22] B-V color index (G1)magphot.color;em.opt.B;em.opt.VfloatU-B[-1.1/0.4] U-B color index (G1)magphot.color;em.opt.U;em.opt.BfloatCII/Hb[0.002/2.8]? CII {lambda}7231 to H{beta} ratiophot.flux;arith.ratiofloatnullableCII[0.47/1] CII {lambda}7231 to {lambda}7236 ratiophot.flux;arith.ratiofloatJ/ApJ/942/85/table2Spectra of candidates lacking CII emissionSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (HHMMSSSss+DDMMSSs; J2000)meta.id;meta.maincharVmag[13.6/18.84] Johnson V-band magnitude (G1)magphot.mag;em.opt.VfloatClassClassificationsrc.spTypecharn_Class[1/5]? Note (1)meta.noteintnullableFileName of the FITS file in subdirectory "fig4"; column added by CDSmeta.id;meta.fitscharZ04Display data from Zaritsky+ 2004, J/AJ/128/1606meta.ref.urlcharfitsDownload the FITS filemeta.ref.urlcharspInteractive spectrum plotmeta.ref.urlchar_RAPositions from 2MASS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS names (declination part)degpos.eq.dec;meta.main